Function of UA 300 D
18
Version 2.03 27. Juni 2008
3.2.5 Fan control with coldroom controllers
Controller type: UR 141
S LT coldrooms (low−temperature coldrooms, UR 141 Zone 1 only)
The fan is normally switched ON and OFF with the cooling relay. During defrosting the fans are OFF.
When the fan load time (start delay) is set greater than 0, the fan stops together with cooling. When temperature
again exceeds the setpoint plus hysteresis, only the fan starts at first. After the fan has started, cooling does not
restart until the set time delay has expired.
This second instance will normally occur following defrosting. The fan is stopped during defrosting and restarts
after defrosting is terminated when temperature on the connected evaporator sensor (R1.1/R1.3) drops below
the fan delay temperature setting. The fan restarts immediately following defrosting when the "Fan Delay" para-
meter is set to "".
Verdampfer 1Evaporator 1
Valve 1
Return
air
R1.1
Fan 1
Supply
air
UA 300 D
ZNR. 51203 72 830 E0
Refrigeration point
controller
R1.1: Defrost sensor (Terminal Z31/Z32)
Valve 1: Solenoid Valve 1 relay (Terminal 25/26/28)
Fan 1: Fan control relay (Terminal 63/64)
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